Do the following steps to change administrator password.

 

1.       Open command prompt in any user

2.       Type the command “net user” and press enter

3.       U’ll get a list of users..

4.       Next type “net user <username> *”. Username is any user account of your choice.

5.       It’ll ask u to type new password but when u type nothing will be displayed.

6.       Re-enter the password.

7.       Thats it you can login into admin account with the new password.. 

 

It’ll never ask for old password.. so it can be done by logging into any account..